In the weeks leading up to his alleged shootings that left three dead and another wounded, former LAPD officer Christopher Jordan Dorner is thought to have stalked some of those named in a manifesto he is believed to have posted online, law enforcement sources told The Times.

Authorities were involved in a massive manhunt for Dorner, 33, and issued alerts across California and Nevada for the former cop, who is suspected of killing a couple in Orange County earlier this week and fatally shooting a Riverside police officer Thursday morning.

Dorner is suspected of visiting the homes of some of those named in the manifesto as he allegedly plotted out his attacks, according to the sources. 

Read more at the LA Times